<template>
	<view class="videoBox">
		<template v-if="isUse">
			<view class="box">
				<view class="line"></view>
				<view class="angle"></view>
			</view>
			<view class="box2" v-if="isUseTorch">
				<view class="track" @click="openTrack('open')">
					<svg t="1653920715959" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg"
						p-id="1351" width="32" height="32">
						<path
							d="M651.353043 550.479503H378.752795L240.862609 364.315031c-3.688944-4.897391-5.660621-10.876025-5.660621-17.045466v-60.040745c0-15.773416 12.847702-28.621118 28.621118-28.621118h502.459627c15.773416 0 28.621118 12.847702 28.621118 28.621118v59.977143c0 6.105839-1.971677 12.084472-5.660621 17.045466l-137.890187 186.228074zM378.752795 598.308571v398.024348c0 15.328199 12.402484 27.667081 27.667081 27.667081h217.266087c15.328199 0 27.667081-12.402484 27.66708-27.667081V598.308571H378.752795z m136.300124 176.942112c-14.564969 0-26.331429-11.76646-26.331428-26.331428v-81.283975c0-14.564969 11.76646-26.331429 26.331428-26.331429 14.564969 0 26.331429 11.76646 26.331429 26.331429v81.283975c0 14.564969-11.76646 26.331429-26.331429 26.331428zM512 222.608696c-17.554286 0-31.801242-14.246957-31.801242-31.801243V31.801242c0-17.554286 14.246957-31.801242 31.801242-31.801242s31.801242 14.246957 31.801242 31.801242v159.006211c0 17.554286-14.246957 31.801242-31.801242 31.801243zM280.932174 205.881242c-9.47677 0-18.889938-4.197764-25.122981-12.275279L158.242981 67.991056a31.864845 31.864845 0 0 1 5.597019-44.648944 31.864845 31.864845 0 0 1 44.648944 5.597018l97.502609 125.551305a31.864845 31.864845 0 0 1-5.597019 44.648944c-5.787826 4.579379-12.656894 6.741863-19.46236 6.741863zM723.987081 205.881242c-6.805466 0-13.674534-2.162484-19.462361-6.678261a31.794882 31.794882 0 0 1-5.597018-44.648944l97.566211-125.551304a31.794882 31.794882 0 0 1 44.648944-5.597019 31.794882 31.794882 0 0 1 5.597019 44.648944l-97.566211 125.551305c-6.360248 8.077516-15.709814 12.27528-25.186584 12.275279z"
							fill="#ffffff" p-id="1352"></path>
					</svg>
					{{ trackStatus ? '关闭闪光灯' : '打开闪光灯' }}
				</view>
			</view>
		</template>
		<template v-else>
			<slot name="error">
				<view class="error">
					<view class="on1">相机权限被拒绝，请尝试如下操作：</view>
					<view>· 刷新页面后重试；</view>
					<view>· 在系统中检测当前App或浏览器的相机权限是否被禁用；</view>
					<view>· 如果依然不能体验，建议在微信中打开链接；</view>
				</view>
			</slot>
		</template>
	</view>
</template>

<script>
	import {
		BrowserMultiFormatReader,
		NotFoundException
	} from '@zxing/library';

	export default {
		props: {
			continue: {
				type: Boolean,
				default: false // false 监听一次   true 持续监听
			},
			exact: {
				type: String,
				default: 'environment' // environment 后摄像头  user 前摄像头
			},
			size: {
				type: String,
				default: 'whole' // whole 全屏  balf 半屏
			},
			definition: {
				type: Boolean,
				default: false // fasle 正常  true 高清
			}
		},
		data() {
			return {
				windowWidth: 0,
				windowHeight: 0,
				video: null,
				inter: 0,
				track: null,
				isUseTorch: false,
				trackStatus: false,
				isUse: true,
				codeReader: null,
			}
		},
		mounted() {
			uni.showLoading({
				title: '加载中...'
			})
			if (origin.indexOf('https') === -1) throw '请在 https 环境中使用摄像头组件。'

			this.windowWidth = document.documentElement.clientWidth || document.body.clientWidth
			this.windowHeight = document.documentElement.clientHeight || document.body.clientHeight
			this.windowHeight = this.size === 'whole' ? this.windowHeight : this.windowHeight / 2

			this.$nextTick(() => {
				this.openScan()
			})
		},
		destroyed() {
			this.closeCamera()
			this.openTrack()
		},
		methods: {
			openScan() {
				const width = this.transtion(this.windowHeight)
				const height = this.transtion(this.windowWidth)

				this.codeReader = new BrowserMultiFormatReader();
				console.log('ZXing code reader initialized');

				navigator.mediaDevices
					.getUserMedia({
						audio: false,
						video: {
							facingMode: this.exact,
							width,
							height
						}
					})
					.then((stream) => {
						uni.hideLoading()
						this.video = document.createElement('video');
						this.video.id = 'video';
						this.video.width = this.windowWidth;
						this.video.height = this.windowHeight;
						this.video.srcObject = stream;
						this.video.style.objectFit = 'cover';
						this.video.style.transition = 'transform 0.3s ease';
						this.video.style.transformOrigin = 'center center';
						this.video.setAttribute('playsinline', true); // 设置 <video> 元素的 playsinline 属性，确保 在移动设备上视频不会自动全屏播放。
						this.video.setAttribute('autoplay', true);
						this.video.setAttribute('muted', true); // 避免 iOS 弹窗
						this.video.muted = true;

						let lastTapTime = 0;
						let isZoomed = false;
						// 手动监听双击事件
						this.video.addEventListener('click', (e) => {
							const currentTime = new Date().getTime();
							const timeDiff = currentTime - lastTapTime;
							if (timeDiff < 300 && timeDiff > 0) {
								// 检测到双击
								isZoomed = !isZoomed;
								this.video.style.transform = isZoomed ? 'scale(3.6)' : 'scale(1)';
							}

							lastTapTime = currentTime;
						});

						const videoBox = document.querySelector('.videoBox');
						videoBox.append(this.video);

						this.track = stream.getVideoTracks()[0];
						setTimeout(() => {
							// 判断是否支持手电筒功能
							this.isUseTorch = this.track.getCapabilities().torch || null;
						}, 500);

						this.$nextTick(() => {
							this.codeReader.decodeFromVideoDevice(null, 'video', (result, err) => {
								if (result) {
									this.getData(result.text);
								}
								if (err && !(err instanceof NotFoundException)) {
									console.error('错误：', err);
								}
							});
						})
					})
					.catch((err) => {
						this.isUse = false;
						this.$emit('error', err);
					});
			},

			closeCamera() {
				this.codeReader.reset()
				if (this.video && this.video.srcObject) {
					// 获取 video 元素绑定的流（srcObject）中的所有媒体轨道（通常是视频轨道），并立即停止它们。
					this.video.srcObject.getTracks().forEach((track) => track.stop());
				}
			},

			getData(result) {
				this.$emit('success', result);
				if (!this.continue) {
					this.closeCamera();
				}
			},

			transtion(value) {
				return this.definition ? value * 2 : value;
			},

			openTrack(type = 'close') {
				this.trackStatus = type === 'open' ? !this.trackStatus : false
				this.track.applyConstraints({
					advanced: [{
						torch: this.trackStatus
					}]
				})
			}
		}
	}
</script>
<style scoped>
	page {
		background-color: #333333;
		overflow: hidden;
	}

	.videoBox {
		width: 100vw;
		height: calc(100vh - 44px);
		position: relative;
		background-image: linear-gradient(0deg,
				transparent 24%,
				rgba(32, 255, 77, 0.1) 25%,
				rgba(32, 255, 77, 0.1) 26%,
				transparent 27%,
				transparent 74%,
				rgba(32, 255, 77, 0.1) 75%,
				rgba(32, 255, 77, 0.1) 76%,
				transparent 77%,
				transparent),
			linear-gradient(90deg,
				transparent 24%,
				rgba(32, 255, 77, 0.1) 25%,
				rgba(32, 255, 77, 0.1) 26%,
				transparent 27%,
				transparent 74%,
				rgba(32, 255, 77, 0.1) 75%,
				rgba(32, 255, 77, 0.1) 76%,
				transparent 77%,
				transparent);
		background-size: 3rem 3rem;
		background-position: -1rem -1rem;
		z-index: 10;
		background-color: #1110;
	}

	.box {
		width: 200px;
		height: 200px;
		position: absolute;
		left: 50%;
		top: 50%;
		transform: translate(-50%, -50%);
		overflow: hidden;
		border: 0.1rem solid rgba(0, 255, 51, 0.2);
		z-index: 11;
	}

	.line {
		height: calc(100% - 2px);
		width: 100%;
		background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
		border-bottom: 3px solid #00ff33;
		transform: translateY(-100%);
		animation: radar-beam 2s infinite alternate;
		animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
		animation-delay: 1.4s;
	}

	.box:after,
	.box:before,
	.angle:after,
	.angle:before {
		content: '';
		display: block;
		position: absolute;
		width: 3vw;
		height: 3vw;
		z-index: 12;
		border: 0.2rem solid transparent;
	}

	.box:after,
	.box:before {
		top: 0;
		border-top-color: #00ff33;
	}

	.angle:after,
	.angle:before {
		bottom: 0;
		border-bottom-color: #00ff33;
	}

	.box:before,
	.angle:before {
		left: 0;
		border-left-color: #00ff33;
	}

	.box:after,
	.angle:after {
		right: 0;
		border-right-color: #00ff33;
	}

	@keyframes radar-beam {
		0% {
			transform: translateY(-100%);
		}

		100% {
			transform: translateY(0);
		}
	}

	.msg {
		text-align: center;
		padding: 20rpx 0;
	}

	.box2 {
		width: 300px;
		height: 200px;
		position: absolute;
		left: 50%;
		top: 50%;
		transform: translate(-50%, -50%);
		z-index: 20;
	}

	.track {
		position: absolute;
		bottom: -100px;
		left: 50%;
		transform: translateX(-50%);
		z-index: 20;
		color: #fff;
		display: flex;
		flex-direction: column;
		align-items: center;
	}

	.error {
		color: #fff;
		padding: 40rpx;
		font-size: 24rpx;
		background-color: #333333;
		position: fixed;
		top: 50%;
		left: 50%;
		transform: translate(-50%, -50%);
		width: 550rpx;
		border-radius: 20rpx;
	}

	.error .on1 {
		font-size: 30rpx;
	}
</style>